diff --git a/homeassistant/components/eheimdigital/climate.py b/homeassistant/components/eheimdigital/climate.py
index 0af7eb0c623..3cde9e758cd 100644
--- a/homeassistant/components/eheimdigital/climate.py
+++ b/homeassistant/components/eheimdigital/climate.py
@@ -40,12 +40,10 @@ async def async_setup_entry(
     coordinator = entry.runtime_data
 
     def async_setup_device_entities(
-        device_address: str | dict[str, EheimDigitalDevice],
+        device_address: dict[str, EheimDigitalDevice],
     ) -> None:
         """Set up the climate entities for one or multiple devices."""
         entities: list[EheimDigitalHeaterClimate] = []
-        if isinstance(device_address, str):
-            device_address = {device_address: coordinator.hub.devices[device_address]}
         for device in device_address.values():
             if isinstance(device, EheimDigitalHeater):
                 entities.append(EheimDigitalHeaterClimate(coordinator, device))
diff --git a/homeassistant/components/eheimdigital/coordinator.py b/homeassistant/components/eheimdigital/coordinator.py
index 6e96fb388ee..df5475b6567 100644
--- a/homeassistant/components/eheimdigital/coordinator.py
+++ b/homeassistant/components/eheimdigital/coordinator.py
@@ -20,9 +20,7 @@ from homeassistant.helpers.update_coordinator import DataUpdateCoordinator, Upda
 
 from .const import DOMAIN, LOGGER
 
-type AsyncSetupDeviceEntitiesCallback = Callable[
-    [str | dict[str, EheimDigitalDevice]], None
-]
+type AsyncSetupDeviceEntitiesCallback = Callable[[dict[str, EheimDigitalDevice]], None]
 
 type EheimDigitalConfigEntry = ConfigEntry[EheimDigitalUpdateCoordinator]
 
@@ -74,7 +72,7 @@ class EheimDigitalUpdateCoordinator(
 
         if device_address not in self.known_devices:
             for platform_callback in self.platform_callbacks:
-                platform_callback(device_address)
+                platform_callback({device_address: self.hub.devices[device_address]})
 
     async def _async_receive_callback(self) -> None:
         self.async_set_updated_data(self.hub.devices)
diff --git a/homeassistant/components/eheimdigital/light.py b/homeassistant/components/eheimdigital/light.py
index 02062831fd3..2725315befd 100644
--- a/homeassistant/components/eheimdigital/light.py
+++ b/homeassistant/components/eheimdigital/light.py
@@ -38,12 +38,10 @@ async def async_setup_entry(
     coordinator = entry.runtime_data
 
     def async_setup_device_entities(
-        device_address: str | dict[str, EheimDigitalDevice],
+        device_address: dict[str, EheimDigitalDevice],
     ) -> None:
         """Set up the light entities for one or multiple devices."""
         entities: list[EheimDigitalClassicLEDControlLight] = []
-        if isinstance(device_address, str):
-            device_address = {device_address: coordinator.hub.devices[device_address]}
         for device in device_address.values():
             if isinstance(device, EheimDigitalClassicLEDControl):
                 for channel in range(2):